Granted Patent
Utility
US 5,210,474 · App. 07/847,147
Digital-analog driver for brushless D.C. spindle motor
Inventor:
Richard Oswald
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Feb 27, 1992
Inventor
Richard Oswald
Assignee (at issue)
Quantum Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.